JBL ES150P, Service Manual

Page: 13 / 34

ES150P Troubleshooting Testing Flow Chart
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Start
Dc voltage check
±Vcc,±15V
O
Check transformer
C
168,
C
169
,D
123
,
D
124,
C
170
Power on check
LED red &green
O
Check vol module
& connector
cable& ±15V.etc
Check THD output
power, noise
O
Check pre board
& power board ,
±Vcc,±15V etc
Test frequency
Response
O
Check U
102
,uR
133
,
C
121,
R
135
,C
122
.etc
Test input sensitivity
O
Check U
101
,R
117,
R
112,
R
114
etc
Test protection
O
Check U
107
.R
237
±15Vcc etc
Test limiter circuit
O
Check U
106
.Q
107
etc
Auto off Function
Hi pot test
O
Check U
103
.Q
101.
Q
102
.C
131.
R
142
;Ac
cord, Transformer.
O
Listening test
O
The Amp ass’y ok
END
Test phase sw,low
pass sw rabos vr
Check sw103,102,
R158,163,177 etc
ES150P
12